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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b504b474894dfe468be15c1ee18ba91ef2aa73bd1ede833891676800ab9133b' 
  AND token = 'gG4t3d9i/vPaK8wuAqNAwZFVVW9z0W8g3mnY2vccr/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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