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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb62d79054371b4ccf66a6689f661dc992c607e109fba548e8cb41a67c57829e' 
  AND token = '04kg8iiX5OKCip/5Ds7sZd4/u1Z3p1qMAzrBI2QiZEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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