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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9cc971e67ef9252b45120b9bc26c3d92403f2a7f0a083a1b5ec0576a3d5839' 
  AND token = 'yG5v0ppgaAG7WnlKqX9+He4yqxBGi2JC8OmUhbobiak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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