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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c909842c3014126ca7585887b0291b369dfa5691e6aa2f309ad69efa9abc5071' 
  AND token = 'gRQgbjl1kWmkcsgEcWp3tZhmMacYk395pD+bf/rk05Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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