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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfb8180ffc2f35eb8666739d6eea2a1c426883c5f19a035f7c4acf062e57dc5' 
  AND token = 'aPZa2QpYgX6SqUyGMcig885C3cPkKQnFq2XytETP0SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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