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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0e56c87a26530a2d93122ae0f7b5441e424f23f7575c077866dd3e7ffcb547' 
  AND token = '5fBb8nTQZnELvnnQPoQDa4I+NMFgkuin3k81iS/5d+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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