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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ec7ac0ad340d0b2e6c899af324e1b2506c2de2450d320db3f84e75380c4073' 
  AND token = '7zUrdAafJedP1QMNf/78+XgYLvlBNwQlPETRQZyL15g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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