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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e003bc52341d1796caf7669874e5984391133a432edf34ca2e8d6b9aa87865' 
  AND token = 'ONNSPEgsN5RXxTR4J1tP4xNFQgUoXIw7eRjy7fZhIVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}