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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6aa08caddab40384bcb39a8e81b5140d5e45237a4644aa7e2d9da7c5273c6e' 
  AND token = 'LoCQ7RLac9nE5E6tjnwQWz+/aoD05W4Ug6yL47DxZc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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