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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640b1438c62dc716528438c293f5833b7d07e9e14227953abcc803567b2a1c2f' 
  AND token = 'KCVf1WB1aiVLjA9ZSKDGVNvJdJKzAyeEx0Si6m1L2WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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