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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab1d46ff39c0fe79e6c5031590604b5ce1a6f147fe4f39ff5e813341eb67c04' 
  AND token = 'UTObhsC7wV94HT7zRRbH3mqftJkNkiivrH7utIrBV1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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