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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06407b7e084a3edbe4887157d91b620b876574c492dc07c867ae4f11c1729249' 
  AND token = 'SUSKJWu2kR2vgaa5CuNKxDGZN4nxCDmYo8T+hv5WpWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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