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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639600e121a6233f4e9980a7a534aea30d1bbba57d9ab4bc37dfd386743172d7' 
  AND token = 'AZxgc/EjlRZ1IYeXXQLCvHfcQLmId7jknlHZOedxLCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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