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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e11ee1ee75f4cde0f451d9d45c529b3ee51f1c56a259eeb04c5a0ec90623da' 
  AND token = 'LhEYp8FAxetvShhnfBIcClO7xP4UrVB6aS3il42zShU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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