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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cca9edf8b8480537e757cbef0e4f37ba1b3ca19fdda0e0dd8238bd5dc97dc9b' 
  AND token = 'B9wdfdaMNBFHclJ9cw83PGfnGNo76lVy5NhltTvbs2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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