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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56ef3ea8f62197a72405b45899f99d74a0d83885e5de87dc6b4d18eb5d32f34' 
  AND token = 'krpJ9Wxzktzuc6kk+k/Icp5f6JM6oJqKqnHrzBN86Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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