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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65695975782252ca49b3cdaacdd6dcfbce276bf5f879d1ec1bdfdfa0f6ccb89f' 
  AND token = 'd3h6ARjYk58oZVANQyWlfmaVcBIH5VaoEga6MRbu6qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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