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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e32335a10500fbb5c26b63dcd9a8df9f53c107ecc6600e65a4095feb1eeeb1b' 
  AND token = 'vqWfiKFgI5BAJKfRoUBPRHFHH8FzO7Rie4+/inbaIZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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