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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d628a04fd0e46a3affe58487fe7e7a9dbf90d736d77945aa86bded41a707590' 
  AND token = 'jm5mtWW/n7ZKetsc5YFq4YRPOrYlDRmvVDVwW1dfakI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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