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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '785e9ad0ad0522808edb00b55b406f05fed479315a1e36797e5a3da48f0977e5' 
  AND token = 'vkyCzhuwKUqYoiecTr0/w8P1aU2TJocmB0a1zIHfXnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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