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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3671c4e75f6045e07ec28030d69c28770f49b734e946695cd60e8ef8b5e500' 
  AND token = 'ch6rjcLCWSB/R7nCpj0aUGwOGBk1IuSUwFnq6yO5iUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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