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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa26e552ad5dc10991321cb8dfc2a802f77da388bb9c19856f005a8bf130f77' 
  AND token = 'QI5kNR5Zp0LNjs6334kVS0tGlUKNt/j0k/qPNEqhM8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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