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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b398d345c59a4e0a1afe97d17828c94ab428a1b50be7f1b4a9b215582df475' 
  AND token = 'Nl1b2EC11bF60JS3HgF4/ikkMGfsyaEHwfC19FCtaWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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