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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83def3a318e8445db8a4ac428faefc2493e85da9fa94e32370e874c2c3757da5' 
  AND token = 'yC3xeDz6+cS75PEDVtdpSyvnFf7nt/okl6Hrx1TLA5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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