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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ae366ecd96ae37442ffa90e13a4a3d902ac436e1a24df47550ca3446e21b6e' 
  AND token = 'zIeJMJmFTqVH/ToRewN79PymxOzEy5ro9wiPnBMPrF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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