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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63ce91817ac09f624578b6f1c2ca13b3d5560b44ff0d184faad2e6242794f18' 
  AND token = 'Gf11JuJ7R/k2XQsLqDRE99fu2tt2+sWflU3Sui5rDTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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