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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8584b48ec6836b34c2cf7476555495366a593fb78f9da7c189295c42685a06a6' 
  AND token = '2rR1RkdAkubBatUvaWUQcB6Gp32Z/m8IhACnQJ3l8CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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