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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14f186bdb0fa9ddf679a809f2e61ab79ebc53eaf559d35d220fcda85a564924' 
  AND token = 'QVJ6NAfE3Rc6WzoUhn1sK5g3L1ODm5/U29W1q/vKX/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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