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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0762451cfc7144cf07db37bfff04a51b7bebcd1de7e31d2c420ac13d53564518' 
  AND token = 'ZqzoWY4dCcc4BPSiBInI5DvqzMF+0GudkK02l2EAPRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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