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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b306e8207e10475257096908486ad23e3bd91ce8d3b3cda7743d46a18aa947' 
  AND token = 'zfrvPOJ72/gCzjducqAcHWlX4dVjjuc7lPy9Psseuuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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