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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7dd3bc57323575bca4accb027e7e8893a7c020cb4bddcdb1ab0d33a8e23e6ec' 
  AND token = 'HidTzBJtxDtHVppQmmqor2D10JcqkpYbBaT3gTzKL4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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