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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7990232236edf85803f1d1647b1018b797cb71ec0adbc81abe3efb1232e72ed7' 
  AND token = 'FYk4+ZWe+/o1uboEprqusy7Y0nYG1pY8iByr0C7Z2EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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