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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8565155907e963f70a4ca2b435d3c19dc5580e93446419d69a17dd8963bf2b12' 
  AND token = 'qXXXbEoikeZXYeP0HAezvJ9Qw6qN2V7CdOxnGasXgJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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