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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ec5c837855065a266a04f7d8ea65fa80bc4808db9f329f66bf62dfe70721d5' 
  AND token = 'ARouR5VD6NwSYsYwDkgEW20VealuQFUu07xJ3EzKLmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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