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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c158b4dda84eae2cd379b6ab431ea336684f0186189c59a94b8f2f24bd8df1' 
  AND token = 'AaE8JTyzdYtN/gb+0mYH0EK5UsEZCfJfmX3Y5v6Vs+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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