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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfea5fa0a8ce7952e2b0fb3a69fd9e6b47a289f71af13de0ba41eb5fc279db24' 
  AND token = 'sz2gQEf0p5ww96UMwbZbiE3NfVkie6u2IePEYCklLuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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