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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de09a9f4ca5e06a9b6de7a24468e1818d90a8ebfeafa19b328f583a1566910ec' 
  AND token = 'eq5qQ4ULnRHyyVkGlrbw/p4FqJIGeAfA1YVnf64fzuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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