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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda7be9c105c9d537a9c47489e581c1c0303ebdc76d0e84bbee9c8bc341481a5' 
  AND token = 'uDe10ig30JA0r313jRFDc8ZnbTpWnwl0NImKe68Y/Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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