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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd4b7c5c344179a8d13dafaac26c701b21c957d71b65a8edd64796d3c610cbf' 
  AND token = '1ijy6rYAS02UQhin9pF3PGPuAZzlRwftM2FLh4yks4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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