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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ac2021e1f38871c46a2f08a5229324e6522a29695b2bcae89294811eaf5385' 
  AND token = 'CklGT8+7disURQbnvj5MkWCGS6a/V/f0dnIGFhrA/JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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