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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965e7dbc92d37e225bee922902227dee75d923ea4361aa220b5995f5a0048a0d' 
  AND token = 'Jr30rI10B3S4QQ+r675n/kzh+AewpxprORtU8a5S+4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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