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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c330c3f98800fcf34e5e48daa858ee83487bfd866c8127b79858203124fe89' 
  AND token = 'TKb/F91gnKT40kU6oo7isq9UTmNISc2PWo0uHQBuLBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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