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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0319f7e9bff2c9f77aba42188b15a42db30553038dfb54e116eaf3a4878b0254' 
  AND token = 'f1LK/DI3f1Wqkubo4c8EGbXuK/j4dpOI3MLEVhTm1og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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