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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b548800cb0ac99e76e71e2bfa9649dd81d66374612d93888b21ad99561561af' 
  AND token = 'mB6S9Y38NqO7kPw8fp4Au5752/5CzUfuzSbcTlcb97E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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