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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5aece438f142b1fbe371454f6277c1ed49c959db925ece7d0486e88752a1d55' 
  AND token = '9bFnpKjlXIq0IvuEAN8Pob7Zie+AJ1r62Y2OuOF2gmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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