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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c86a40a01ad15baf8633f39a7c743f06b0c9dea19c7954a0ae575e61f56c55b' 
  AND token = 'trzl67YQWPlPj5/Dc3VLh2oThnAurgDi+HwdtsVozz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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