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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfcace7991f61adc0b37327c32766d4419e8a3ffba79701a60665cf163794356' 
  AND token = '3dTJ227TySPU/OPRfhD3vftUipG0mw+Hlyj+vtlSIo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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