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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e656decb80ad91e56e02b288e654553267a1327640dc26b3fa57d8ccfa9a8f98' 
  AND token = 'fGjqIzo2BlmtwofC69YyMCArIyzY9GFnyvr5lRvvNhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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