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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2132d2704d43c5edf247ef818cd9e4bcddcdf693f863cae95a0ad2abc762c5' 
  AND token = 'R38CQLR8z1tvLHyHuRuNPmE7QCKsa8sCzb5QcU2MKnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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