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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a185a4e115d02cea544767864eb5945489adf6c1e3218e4eed488b912556ef8a' 
  AND token = 'mJ9LMNxfVdl8556sxVfB0kSC4napXPjSnc68KC5mf1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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