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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcaab8de1a195471ad4aa789665f80897eb70f999a3251836c11bb7d0d0b408' 
  AND token = 'qaV2xf78eQ2/+jJgthtLvOC8+dCKR2ODaxLUmPf5URU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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