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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd440ca0e0992dd6263509e0b41182b3b95d79dc76e526e5c8f8f6772866b0aeb' 
  AND token = '2D8G3p2YPDyjBFEbLWzuB1LZIvTG8gpAlewNORc6GK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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