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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5ec98bf779715dd5157404dc2713d2bdf5d9c0e2db10d78045439ca2f7b1eb' 
  AND token = '8mUK0H+9qDa3jii02E0SOLGZ2S4DLA9/E4Yjc3Fb2H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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