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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a362a9ac30591d346bf75121db31a2ac5a73a5a6bd22e6947d2a439e7d962a' 
  AND token = 'JTASP6WnG1XOl+OvAQfl2yKNUvkJPD4UYaPnTECwUE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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