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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844519232eeea65d3ff55ecbfe3cef47a90577379e3e244e0b96f07748f76c23' 
  AND token = 'O32F2pAqBzJJL8JSTr1KtM0AVfwvopt9AlGm3OK/orE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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