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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb47ed9ddfd1565a1b2c3613cdcba04051ed184162998191c0c23981a83edcd4' 
  AND token = 'NH2SygJ9eWWuLcVDDs9fbPDyn8CEBuSFfxUm3VAv+d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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