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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170a17a95cf5e3030cf12f60146f6bc54b2f69fa7abaabd44c138698b0a4d193' 
  AND token = '5GxH8AT7FZi/zcgxueQCVFur+fUNHcq0ovMO79nh83I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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