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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5f512737a48daf768887a864b534aa7c3c2300518e64ac4575f8d867671a28' 
  AND token = 'iuWH2c3npBcQJdi5FdlHZCAOYzn0xb1eVoxFGSqohrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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