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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96283926f6b18c62a7afc02711b8a5d5505b5e9d392663084ec9636be6573867' 
  AND token = 'pe+WnkLc4Ds0DbWujbg6nslq+7PYIOf8J4mKSFOwuKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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