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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85706042060570d260c04a4aae6188f1314746e496c28a7698cfc3d9354ef52' 
  AND token = 'WSQLxO05RxFQeAdS3y6FsFwBgLIv2IO4S1Kni+kowHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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