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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9795bf52084c8d1c1e3e7ac778a872061a0b6c884f7b91001b68aded0755f137' 
  AND token = 'XDfOt9R2CnaW7x+5JTak+DewDqimi7USVavy7aV6bUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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