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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0490eac04ca952a5f7bd0ad616f9c34f1387c6f336646e544b972b754fdcd554' 
  AND token = 'bRYr1rcxB9L/VuCd0QQJjDgfF9rql0SnX7xwA3Xd9A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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