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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f25b9e6d1c785a6f6d9a374d9e523f17514785fcc8bc87fc829e7af1399e6ee' 
  AND token = 'OW5t/md6bhxlFfQ1E7HVZT/w3TH4zYq1eyvnRGhi1fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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