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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37fd273b4afc850cf6e618db42af00be0ad3369fb3dc8685fef5c66b6744ae5' 
  AND token = 'lo48oqlqHq6U7H0ArBIVdD6xU/Y7ynylT9S20KFzknY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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