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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52852d355eaf59f16087f38204f3d12fd049531c6729ac51dd742e6c85de3a0' 
  AND token = '0vF4vzilYNVScWy+QJ9v+7u0AJ+4rXhETi5LXXV6qHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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