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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39052bac959c42619533be7f87b5d442eff1915a25aa95f40410c80a476d2042' 
  AND token = 'EQmxa+kYkpv9IqeQITPaWGvfbWoh27cKkDzCodvcc+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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