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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35d5febe4d94895185856453eca3aaa4e340ae162ad97f0ff42787cacf30039' 
  AND token = 'dy6oeGXRJYYWV4V2fFnVNE+/R16+Qc0vX4J2+2V4K2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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