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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adaa721f575f1d57fb04a7d780ad7f6ba1c87b42056dd1d27dd0af6616b94f06' 
  AND token = 'TKtWjHun3Qi4AhGu3rKO8JdYt6M+GWmED63EBOVpWNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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