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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4502e6118893aa5cd619ef8f2150ddaba08ccb2c50ce6b3c542cec2dc53d35f3' 
  AND token = 'g4oI3rA/DSP++wovN0s5I6dz+7go6V+dAcAWKOPhogE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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