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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763e076a3bada3c05a9808f9d4c49638e15b3734d8ace73285fb112b3e513c23' 
  AND token = 'TRR/U3NveA+uuCE8F9GHPGEOxaI/z095SZ7pZffy6f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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