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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d471506825090e37e6521410efb65c3a78c228afe2f4bd1f30d7dee2dee767c' 
  AND token = 'Wn8Mti5IpGnygfQeBhVA152NE3YASyzkJGyIpTMSQV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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