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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b83e2c934f418e3bf90cb5ffa10457e4cf98f160e743dba838ff2ec930e0794' 
  AND token = 'BElta9d1azFHhDaXXe9vFuDNuEJS8/qIc1y4/oGNpxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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